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"We strongly caution actors external to the Western Hemisphere against deploying military assets to Venezuela, or elsewhere in the Hemisphere, with the intent of establishing or expanding military operations," national security adviser John Bolton said in a statement Friday.

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"We will consider such provocative actions as a direct threat to international peace and security in the region," he added.

Also a warning to Maduro: Bolton also took aim at Maduro and urged members of Venezuela's military to support the interim government declared by opposition party leader Juan Guaidó.

"Maduro will only use this military support to further repress the people of Venezuela; perpetuate the economic crisis that has destroyed Venezuela's economy; and endanger regional stability. We call on the Venezuelan military to uphold its constitutional duty to protect the citizens of Venezuela," Bolton said.

U.S. raising pressure: The U.S. has led nations in recognizing Guaidó as Venezuela's leader.

What's next? Trump has said all options are on the table for dealing with the crisis in Venezuela.

"Past administrations allowed this to happen," Trump said on Wednesday. "I've inherited a mess between North Korea, and all of the problems we have all over the world, the entire Middle East and Venezuela. These are things that never -- they never should have happened."

"But I'll fix it," he added. "We're fixing it all over the world. That's what we're going to do."

In Venezuela: Maduro's government is attempting to cling to power as the country faces blackouts and shortages of food and medicines, problems he has blamed on the U.S. The New York Times reported Friday that Maduro has decided to allow the Red Cross to deliver aid to help alleviate the humanitarian crisis in the country.

The new construction will be funded by $1 billion recently transferred by the Pentagon under Trump's national emergency declaration and could begin by late May if the Department of Homeland Security issues environmental waivers, which would expedite construction, according to CNN.

A spokesperson for the Army Corps of Engineers confirmed to The Hill that teams of experts and engineers are looking at sites in Yuma, Ariz., and the New Mexico portion of the El Paso sector, which also includes Texas.

The current timeline: Each assessment will reportedly take roughly seven days and will likely be followed up in April by contracts being sent to builders and formal engineering surveys, CNN reported.

The Army Corps of Engineers spokesperson did not confirm the timing of the projects.

The construction is part of an additional 57 miles of fencing being placed along the U.S.-Mexico border as well as improvements to roads and other measures in the region. The Pentagon announced its approval of the $1 billion transfer this week and said it will direct the funds toward building an 18-foot-high fencing along the Yuma and El Paso sections of the border.